冰水堆积体液塑限及击实指标参数修正的研究  

Research on the Plastic Limit and Compaction Index Parameter Correction of Ice Water Accumulation Fluid

作　　者：张振 ZHANG Zhen(Sichuan Institute of Geological Engineering Investigation Group Co.,Ltd,Chengdu 610032,China)

机构地区：[1]四川省地质工程勘察院集团有限公司,四川成都610032

出　　处：《云南水力发电》2025年第1期43-46,50,共5页Yunnan Water Power

基　　金：成都理工大学地质灾害防治与地质环境保护国家重点实验室自由探索课题(SKLGP2011Z009)。

摘　　要：通过常规方法求得的冰水堆积体细粒土的液性指数小于零,这与冰水堆积体的野外实际情况不相符,分析得出此与常规方法测得的天然含水率失真有关。故结合冰水堆积体自身的特点,对冰水堆积体细粒土的天然含水率计算方法进行了修正,修正后的冰水堆积体液性指数计算公值更为合理。文章把粒径5 mm作为冰水堆积体土石分级的一个界限粒径,通过改变土石含量的关系,调配不同含水率下的试样进行击实试验,从而求取不同含石量下的最大干密度和最优含水率,试验结果显示含石量在40%~60%之间时,最优含水率相差不多,但随着含石量的降低,最优含水率在缓慢的增加;当含石量小于40%时,最优含水率随着含石量的降低,有较为明显的增加。分析认为含石量40%可以作为冰水堆积体击实试验的一个分界点,而不是一般粗粒土中认为的30%,故针对冰水堆积体这类物质,当土中粒径大于5 mm的粗颗粒含量小于40%时,建议对击实指标计算公式进行校正。The liquid index of fine-grained soil in ice water deposits obtained through conventional methods is less than zero,which is inconsistent with the actual field situation of ice water deposits.After analysis,it was found that this is related to the distortion of natural moisture content measured by conventional methods.Therefore,based on the characteristics of the ice water accumulation body itself,the calculation method for the natural moisture content of fine-grained soil in the ice water accumulation body has been revised,and the revised calculation of the water permeability index of the ice water accumulation body is more reasonable.The article uses a particle size of 5mm as a boundary particle size for the classification of ice water accumulation soil and rock.By changing the relationship between soil and rock content and preparing samples with different moisture contents for compaction tests,the maximum dry density and optimal moisture content under different rock contents can be obtained.The experimental results show that when the stone content is between 40%and 60%,there is not much difference in the optimal moisture content,but as the stone content decreases,the optimal moisture content slowly increases.When the stone content is less than 40%,the optimal moisture content increases significantly with the decrease of stone content.It is believed that a rock content of 40%can be used as a boundary point for the compaction test of ice water accumulation bodies,rather than the commonly assumed 30%in coarse-grained soils.Therefore,for materials such as ice water accumulation bodies,when the content of coarse particles with a particle size greater than 5mm in the soil is less than 40%,it is recommended to correct the calculation formula for compaction indicators.

关 键 词：冰水堆积体 液性指数 击实试验 最大干密度 最优含水率 

分 类 号：TU411.99[建筑科学—岩土工程]